This design is based on the LED7707 and implements a high efficiency monolithic boost converter and six controlled current generators (rows) specifically designed to supply LEDs arrays used in the backlight of LCD panels. The device can manage an output voltage up to 36 V (i.e. ten white-LEDs per row).
The generators can be externally programmed to sink up to 85 mA and can be dimmed via a PWM signal (1% of minimum dimming duty cycle at 1kHz can be managed).
The device allows to detect and manage the open and shorted LED faults and to let unused rows floating.
Basic protections (output overvoltage, internal MOSFET overcurrent and thermal shutdown) are provided.
| Manufacturer | STMicroelectronics |
|---|---|
| Category | Lighting |
| Sub-Category | LED Drivers - DC In |
| Eval Board Part Number | 497-10044-ND |
| Eval Board Supplier | STMicroelectronics |
| Eval Board |
Board not Stocked
|
| Voltage In |
4.5 ~ 36 V
|
| Topology |
Step Up
|
| Current Out |
85 mA
|
| Voltage Out (Max) |
36 V
|
| Outputs and Type |
6 Non-Isolated
|
| Efficiency @ Conditions |
>92%, 24V in, 60 LEDs @ 60 mA
>88%, 12V in, 60 LEDs @ 60 mA |
| Features |
Dimming Control
Light Load Mode Open Circuit Protection Open LED Status Pin Over Voltage Protection Short Circuit Protection Soft Start Synchronizable Thermal Protection |
| Switching Frequency |
825 kHz
|
| Component Count + Extras |
22 + 19
|
| Design Author |
STMicroelectronics
|
| Application / Target Market |
LCD Backlighting
LCD TV / Monitor |
| Main I.C. Base Part |
LED7707
|
| Date Created By Author | |
| Date Added To Library | 2011-12 |
Slovenia
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